質問編集履歴
2
修正
test
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File without changes
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test
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@@ -278,7 +278,7 @@
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<div>
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281
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-
<button onClick={() => {this.buttonClick();}>ボタン</button>
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281
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<button onClick={() => {this.buttonClick();}}>ボタン</button>
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</div>
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1
コードの追加
test
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@@ -1 +1 @@
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1
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子のcomponent
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子のcomponentから親のstateを更新させた後に子が持ってるpropsを更新させたい
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test
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@@ -1,3 +1,297 @@
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1
1
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あるcomponentでcomponentWillUpdate()をし、
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3
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state、またはpropsが更新されたタイミングで子のcomponentにpropsで親のcomponentのstateを渡したいのですがどうすればできますか？
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## コード
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8
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9
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親component
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10
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11
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```
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13
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import React from 'react';
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import PropTypes from 'prop-types';
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import component1 from './component1';
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import component2 from './component2';
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class parent extends React.Component {
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constructor(props) {
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super(props);
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this.state = {
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array: [
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{ test: 'test1', test1: false, index: 0},
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{ test: 'test2', test1: false, index: 1},
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{ test: 'test3', test1: false, index: 2},
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],
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};
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}
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onSubmitState() {
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this.setState({
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array: [
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{ test: 'aaa', test1: true, index: 0},
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{ test: 'bbb', test1: true, index: 1},
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{ test: 'ccc', test1: true, index: 2},
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],
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});
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}
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cmp1Props(obj) {
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return (
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<component1
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cmp1Props={obj}
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/>
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);
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}
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cmp2Props(obj) {
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return (
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<component2
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cmp2Props={obj},
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onSubmitState={() => {this.onSubmitState();}}
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/>
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);
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}
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render() {
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const cmp1 = this.state.array.map((e) => {
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return (
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this.cmp1Props(e)
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);
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});
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const cmp2 = this.state.array.map((e) => {
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return (
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this.cmp2Props(e)
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);
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});
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return (
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<div>
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{cmp1}
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{cmp2}
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</div>
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);
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}
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}
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export default parent;
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```
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component1(子)
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```
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import React from 'react';
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158
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import PropTypes from 'prop-types';
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160
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class component1 extends React.Component {
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static propTypes = {
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cmp1Props: PropTypes.object,
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};
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constructor(props) {
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super(props);
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this.state = {
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test: this.props.cmp1Props.test,
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test1: this.props.cmp1Props.test1,
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};
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}
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render() {
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if(this.state.test1) {
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return(
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<div>
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<p>成功</p>
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</div>
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);
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} else {
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return(
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<div>
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<p>失敗</p>
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</div>
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);
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}
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}
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}
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export default component1;
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```
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component2(子)
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```
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import React from 'react';
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import PropTypes from 'prop-types';
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const propTypes = {
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cmp2Props: PropTypes.object,
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onSubmitState: PropTypes.func
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};
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class component2 extends React.Component {
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constructor(props) {
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255
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super(props);
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256
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this.state = {
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index: this.props.cmp2Props.index,
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};
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}
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buttonClick() {
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return this.props.onSubmitState();
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}
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273
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274
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275
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render() {
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276
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277
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return(
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278
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279
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<div>
|
|
280
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+
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281
|
+
<button onClick={() => {this.buttonClick();}>ボタン</button>
|
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282
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+
|
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283
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+
</div>
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284
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+
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285
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);
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286
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287
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}
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288
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289
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}
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290
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291
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292
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293
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component2.propTypes = propTypes;
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294
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295
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export default component2;
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296
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297
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```
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